SEGMENTED INFORMATION (Details) - USD ($)	Jul. 31, 2017	Jul. 31, 2016
Mineral Rights and Properties	$ 38,931,976	$ 37,973,951
Property, Plant and Equipment	6,791,182	6,942,304
Reclamation Deposits	1,706,028	1,706,027
Equity-Accounted Investment	151,676	0
Other Long-Term Assets	1,004,975	1,553,388
Total Long-Term Assets	48,585,837	48,175,670
United States Texas [Member]
Mineral Rights and Properties	12,780,728	13,191,408
Property, Plant and Equipment	6,414,329	6,573,079
Reclamation Deposits	1,690,209	1,690,209
Equity-Accounted Investment	0
Other Long-Term Assets	422,769	0
Total Long-Term Assets	21,308,035	21,454,696
United States Arizona [Member]
Mineral Rights and Properties	10,932,199	10,891,861
Property, Plant and Equipment	0	0
Reclamation Deposits	15,000	15,000
Equity-Accounted Investment	0
Other Long-Term Assets	0	0
Total Long-Term Assets	10,947,199	10,906,861
United States Other States [Member]
Mineral Rights and Properties	705,464	810,127
Property, Plant and Equipment	0	0
Reclamation Deposits	819	818
Equity-Accounted Investment	0
Other Long-Term Assets	582,206	0
Total Long-Term Assets	1,288,489	810,945
Canada [Member]
Mineral Rights and Properties	0	0
Property, Plant and Equipment	11,185	14,909
Reclamation Deposits	0	0
Equity-Accounted Investment	151,676
Other Long-Term Assets	0	0
Total Long-Term Assets	162,861	14,909
Paraguay [Member]
Mineral Rights and Properties	14,513,585	13,080,555
Property, Plant and Equipment	365,668	354,316
Reclamation Deposits	0	0
Equity-Accounted Investment	0
Other Long-Term Assets	0	1,553,388
Total Long-Term Assets	$ 14,879,253	$ 14,988,259